The sublittoral fauna of two sandy bays on the Isle of Cumbrae, Firth of Clyde

Clark, Robert B.; Milne, A.

doi:10.1017/s0025315400008663

Cited by 51 publications

(20 citation statements)

References 15 publications

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“…Clark & Milne (1955) and Hughes (1970) report that, in the sub-littoral zone, the distribution of animals is random, as is also recorded here for the distribution of the L. lithophaga population in the N. Evoikos Gulf. Kosler (1968) found that in the eulittoral zone, distributions were typically contagious.…”

Section: Spatial Distributionsupporting

confidence: 83%

Population dynamics of the date mussel,Lithophaga lithophaga (L., 1758) (Bivalvia: Mytilidae), in the Evoikos Gulf (Greece)

Galinou-Mitsoudi

Sinis

1997

Helgoländer Meeresunters.

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Changes with time in a Lithophaga lithophaga population, spatial distribution, size-frequency distribution and recruitment were studied. The population was homogenous, without statistically significant dilferences, down to a depth of 6 m, the depth to which sampling was carried out. Population density showed periodic variations over the year and changed as the gradient of the substratum increased. Dispersion indices indicated that individuals were distributed randomly m clumps during the period of recruitment at different depths. Juveniles, up to a length of 4 mm, formed the highest percentage of the population. Larvae settled at a length of > 260 lam, and individuals reached a length of 35 mm by the end of their first year. The appearance of newly settled individuals occurred two months after the maximum occurrence of larvae in the water. High percentages of settled spat were first observed in early winter at a depth of between 0-3 m although, later, higher percentages were found at 3-6 m depth.

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Section: Spatial Distributionsupporting

confidence: 83%

Population dynamics of the date mussel,Lithophaga lithophaga (L., 1758) (Bivalvia: Mytilidae), in the Evoikos Gulf (Greece)

Galinou-Mitsoudi

Sinis

1997

Helgoländer Meeresunters.

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“…The use of nearest neighbour analysis to study the dispersion pattern in the natural population is inappropriate because of the difficulty of marking and measuring the distance between many hundreds of cockles. Instead, the dispersion pattern was determined by the X 2 approximation to the Fisher Coefficient of Dispersion (Holme 1950, Clark & Milne 1955. The coefficient of dispersion was calculated from counts of the number of cockles in 25 X 0.04 m2 quadrats taken from within an area of 1 m2.…”

Section: Methodsmentioning

confidence: 99%

Emergence pattern and spatial distribution of the common cockle Cerastoderma edule

Richardson¹,

Ibarrola²,

Ingham³

1993

Mar. Ecol. Prog. Ser.

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When groups of freshly collected cockles Cerastodema edule L. were transferred to laboratory conditions and exposed to cycles of tldal emersion and immersion and a light regune of 12 h light. l 2 h dark, up to 40% of the group emerged onto the surface of the substratum during emersion at the onset of darkness. This pattern of emergence decreased in intensity from 37% to 10% of all individuals emerging after 30 d in the laboratory. However, not all the same cockles emerged each day. After emergence, the cockles remained quescent until Immersion, when they actively roamed and ploughed across the sand surface and then reburrowed. During movement the cockles produced furrows up to 0.5 m in length; at hlgh densities cohsions with other buried cockles occasionally occurred, which in turn stimulated emergence and a change of posihon. Groups of cockles previously exposed to a hdal cycle and 1ight:dark regime responded to continuous darkness by emerging onto the substratum for 3 low tides before the activity pattern disappeared. The intensity of the emergence pattern in continuous darkness was less than the nocturnal activlty observed during light :dark conditions. Similarly, under contmuous immersion, emergence during darkness was less pronounced than under sunulated tidal emersion. In continuous illummahon an emergence pattern was absent. The nocturnal pattern of emergence observed in the laboratory can be explained in terms of the cockles' reaction to burial with sediment. In laboratory experiments, cockles which were buned with a covering of sediment at the onset of emersion responded immediately by emerglng onto the sedvnent surface. One group maintained in continuous darkness emerged at low water and continued to roam and plough across the surface when they were immersed, whereas a second group sublected to continuous ~Uumination emerged upon burial and then reburrowed. Sirmlar experiments carried out in the natural environment confirmed the biological sigmficance of the laboratory-induced emergence rhythm. On the shore, replicate areas were covered with sediment during daylight, just prior to emersion of the natural cockle beds. Approximately 1.5 h after burial, cockles were observed to emerge with peak activity at the onset of darkness, and agaln 24 h later. However, cockles &d not emerge in any numbers In control areas in which no sediment was added. The sudden burial of cockles with sediment during a storm w l l stimulate them to move in order to maintain contact with the sand surface for feeding and respuation. The disturbance of cockles dunng collection and the sudden onset of darkness in the laboratory followed by the immediate emergence of the cockles, simulated the cockles' reactlon to deposition of sedlrnent in the field. The observed crawhng and burrowing behaviour of the cockles dunng high tide and darkness represents a situation in which the cockle is continuing to try to emerge as d it was still covered in sediment.

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“…Bivalve molluscs were more abundant subtidally and contributed significantly to both total numbers and biomass. Unusually, the most abundant bivalve was Cochlodesma praetenu, replacing Fabulina fabula which is the dominant subtidal mollusc on most Scottish beaches (Stephen 1929, 1930, Clarke & Milne 1955, McIntyre & Eleftheriou 1968, Ansell & Gibson 1990). …”

Section: Areamentioning

confidence: 99%

Seasonal and annual variations in abundance and species composition of fish and macrocrustracean communities on a Scottish sandy beach

Gibson¹,

Ansell²,

Robb³

1993

Mar. Ecol. Prog. Ser.

120

100

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Forty-three species of fishes and 16 species of larger crustaceans were caught by trawl and seine during a 4 yr study on a sandy beach on the west coast of Scotland. There were considerable differences in the species composition of the trawl and seine catches such that neither alone provided an adequate description of the sampled cornnlunity. Approximately monthly s a m p h g demonstrated a clear seasonal cycle in abundance and species composition. A few species were resident on the beach all year round; the majority were only present from spring to autumn. Increases in both numbers and species were caused mainly by the recruitment of young of the year individuals whose numbers subsequently declined rapidly probably due to a combination of predation and emigration. There were marked differences in both species composition and abundance between years. Annual cycles in species richness and abundance closely paralleled those of temperature and sahnity. It is suggested that the cycles result mainly from recruitment and mortality rather than from immigration and emigration in response to physical factors.

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The sublittoral fauna of two sandy bays on the Isle of Cumbrae, Firth of Clyde

Cited by 51 publications

References 15 publications

Population dynamics of the date mussel,Lithophaga lithophaga (L., 1758) (Bivalvia: Mytilidae), in the Evoikos Gulf (Greece)

Population dynamics of the date mussel,Lithophaga lithophaga (L., 1758) (Bivalvia: Mytilidae), in the Evoikos Gulf (Greece)

Emergence pattern and spatial distribution of the common cockle Cerastoderma edule

Seasonal and annual variations in abundance and species composition of fish and macrocrustracean communities on a Scottish sandy beach

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